 Thu Jul 10 16:41:18 2025, Christina, Update, TCS, 
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[Christina, Ma, Tyler]
Pomona Box completed and is now on the server rack in 1119. Additionally, the photodetectors were connected to the
box and set up in front of the heater elements. |
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Tue Jul 15 10:40:23 2025, Christina, Update, TCS,
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[Christina, Ma, Tyler]
Yesterday, Ma and I started taking data for the PSD/CSD measurements while the photodetectors and one of the heater
elements are on (8) and are using the Red Pitaya to compare it to the data we took for the same measurements on the CyMAC. It will be finished Wednesday
morning, and then we plan on starting to take additional recordings in order to conduct the same type of comparison for the dark noise measurements. |
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Tue Jul 15 13:13:48 2025, Christina, Update, TCS, Photodetector optical post assembly
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| |
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Tue Jul 22 12:20:29 2025, Christina, Update, TCS,
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[Ma, Christina, Tyler]
Figure 1 shows the following PSDs for channels 0-15 from the 14 hour test. Figure 2 shows the reduced chi squared and
CSD plots for both the 2 Hz and 16 Hz resolutions.
|
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Tue Jul 29 12:30:00 2025, Christina, Update, TCS, 260 hour ADC update
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[Ma, Christina, Tyler]
ADC CyMAC 260 hr, 8192Hz sampling rate channels V3 and Vref6 |
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Mon Aug 11 22:19:50 2025, Christina, Update, TCS, Red Pitaya Data Streaming
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[Ma, Tyler, Christina]
This past week, we were able to set up the data streaming for continuous acquisition to the PCs, and can conduct the initial tests now. We were
able to do this by:
Installing the correct OS ecosystems to each Red Pitaya
Installing the terminal streaming client
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Tue Aug 12 13:46:56 2025, Christina, Update, ,
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| |
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Tue Aug 19 12:08:40 2025, Christina, Update, TCS, RP Initial vs CyMAC Plot Comparisons
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[Tyler, Ma, Christina]
These are the frequency averaged and veto binned plots for the initial Red Pitaya and CyMAC systems. |
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Thu Jul 27 10:18:43 2023, Celeste, Update, TCS, Graphical Updates to HOM RH Modification
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| Attached are updated graphs of the irradiance distribution from the 1/8th ring heater units (extruded and reduced in length). |
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Fri Jul 28 17:45:45 2023, Celeste, Update, TCS, Graphical Updates to HOM RH Modification, Friday 7/28
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| Updated 1/8th Heater simulation modification graphs. Slides 7, 10, 16-19 are new additions. |
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Tue Aug 1 16:22:35 2023, Celeste, Update, TCS, Graphical Updates to HOM RH Modification, Tuesday 8/1
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| Slides 20-33 are newly added (data/graphs from parameter sweep feature-1/8th heater unit length varied from 10% of original to 100% of original). |
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Thu Aug 10 14:13:38 2023, Celeste, Update, TCS, 8/10/23, Simulation Graphical Progress
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| |
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Fri Aug 11 10:57:20 2023, Celeste, Update, TCS, 8/11/23 Simulation Progress
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| |
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Tue Aug 15 16:10:06 2023, Celeste, Update, TCS, 8/15/2023 Simulation Progress
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| |
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Tue Jun 3 11:54:06 2025, Cece Ochoa, Update, , CE Cavity Design Update
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| Update on the design for the CE Cavity Mirrors |
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Tue Jun 21 18:31:49 2022, Cassidy and Phoebe, Update, Cameras, IR Absorbing Screen and FLIR Camera Setup
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Today we set up the IR absorbing screen and the camera on the optical table, as well as tested that the camera was functioning as expected (picking up heat
sources beyond the screen).
Screen Setup
The screen was set up by clamping it between two rectangular posts on each side. First, two posts
were set up with 22 in. between them (thus allowing the screen to span a total distance of up to 24 in. when clamped down). To best stabilize the screen |
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Tue Jul 26 14:10:35 2022, Cassidy, Update, Cameras, Optical Post Replacement and Realignment
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Today I replaced the 3" optical post that the camera rests on with a 2" optical post in order for the screen to correctly fill out the camera's FOV. The
3" post is now in the glass optics cabinet next to the FLIR camera configuration box, wrapped in the protective materials from the 2" post for safekeeping.
There were no issues with the physical replacement of the post, except that the fork clamp on the post needs to be on one of the perpendicular, |
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Thu Apr 27 16:23:44 2023, Cao, Pamella and Julian, Physics, VAC, Installing vacuum system (cont.)
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[Pamella, Cao and Julian, Shane]
Particles account
10:37 am: Starting the particles account
Zone 3:
0.3u: 1662
0.5u: 872
1.0u: 415
Zone 4:
0.3u: 831
0.5u: 124
1.0u: 0
11:14 am: Start removal of calibrated leak to install 45 deg elbow
11:21 am: |
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Mon Oct 3 17:21:39 2022, Cao, Update, TCS, Inspection of macor parts 7x
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The macor parts arrived and inspected today. These include:
Macor spacer (drawing: LIGO_Redesign_Macor_Spacer_Drawing_v4.pdf
attached below), quantities: 40
No defects, damages observed
Parts are free from grease/ machining fluid
Wall thickness
of 1 mm appear to provide sufficient stiffness to part
Images of parts: Macor_spacer_0.jpg, Macor_spacer_1.jpg
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Tue Apr 11 13:15:40 2023, Cao, Infrastructure, Clean & Bake, Nitrogen gas tank replaced
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The nitrogen gas tank has been replaced with a new unit. The new tank is ultra pure nitrogen (>99.9% nitrogen).
The new tank has been placed and secured
to the rack where the old one is; cap is removed and regulator is reinstalled onto the new tank. |
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Wed Apr 12 16:13:19 2023, Cao, Physics, VAC, Vacuum prep and installation
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Aiden, Pamella, Peter, Shane, Cao
Today we started vacuum chamber assembly work
10:16 am: Particle count measurement of clean
room
10:34 am: Particle counting finished: meets ISO 5 standard
Zone 3 :
0.3 u: 3159
0.5 u: 789
1.0 u: 83
Zone 4 :
0.3 u: 498
0.5 u: 41
1.0 u: 0
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 Fri Apr 28 18:16:57 2023, Cao, Physics, VAC, Grounding vacuum system
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Quote:
This afternoon I made up a green 10
AWG grounding cable and connected it to the vacuum system. |
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Fri Apr 28 19:00:13 2023, Cao, Physics, VAC, Tighten CF ports on vacuum chamber
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[Cao]
After Jon's comment yesterday that some of the connection did not seem to have good metal-metal contact, in particular the gate valve connection,
I went through the ConFlat connections today and retighten them.
I found a lot of the CF connections are not particularly tightened and there were a lot
of range left that can be tightened with the wrench. After re-tightening, the copper gaskets are not visible anymore. For example, see the attached images |
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Fri Apr 28 19:39:19 2023, Cao, Summary, General, Clean and Bake Leybold TTR 91 Pirani Gauge
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Quote:
I took batch 12 out of the oven and put
them in a bag and placed the bag inside the clean room in the first large stainless steel container.
I also looked at the small gauge that we felt like |
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Sun May 14 15:50:48 2023, Cao, Infrastructure, Computers, High resolution display of logrus machine
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[Cao]
The display resolution of the logrus has been 1064x768 and has been the only option, which is not great. While remote access to logrus using
rdesktop allows rendering a virtual display of user's chosen resolution, it is not fast when using graphic-intensive program. NoMachine allows user to
take over and control the machine remotely and thus appears as the same machine. However, NoMachine cannot render a virtual display like rdesktop. This |
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Wed Jun 21 20:25:05 2023, Cao, Infrastructure, VAC, Vacuum chamber bake attempt 1 6x
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TL;DR:
We are not yet able to bake the chamber at 150 deg C due to some current limit, most likely caused power supply switching off. Also,
smoke was observed at some insulation points, mainly in the small arm sections, This is likely because the insulation does not fit well and the velcro
came into direct contact with heat tape. Some Velcro (made from Nylon/ Polyester) has lower melting temperature point (in 90-120 deg C range)
Full |
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Mon Jul 3 14:32:24 2023, Cao, Infrastructure, VAC, Cooling down vacuum chamber
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[Cao]
After leaving the the chamber to bake at 120 deg C from Thursday 3:41 pm. Today I started to cool the chamber down to room temperature at
11:30 am (total bake duration: 91 hours 49 minutes). Ideally, this process should be ramped down slowly, approx. 6 degree per hour. However we had no ramping
function with out controller. The only method to tune this cool/ heat rate is to tune the PID parameters, which are:
Pb : Proportional |
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Mon Jul 3 16:26:21 2023, Cao, Infrastructure, DAQ, Access and control Red Pitaya remotely and run it on local machine
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[Cao]
To access and control the Red Pitaya using Python locally on a machine within the local network, one should follow these steps:
Start the SCPI server. This is achieved by first log onto the Red Piatay page
rp-xxxxxx.local/
Go to Development >> SCPI server and turn the server on. (Note : The server is currently running)
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Fri May 12 20:28:34 2023, Aiden, Cao, Physics, VAC, Vacuum chamber Helium leak test
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[Aiden, Cao]
1. Helium leak test
2:00 pm: Uninstall regulator from nitrogen gas tank and move to helium gas tank. Place helium onto
cart and move to the rear door of the clean tent. With the tank remaining outside, feed hose through the flexible wall to use in clean tent - See attached |
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Wed Jul 5 15:46:47 2023, Aiden, Cao, Infrastructure, VAC, Vacuum Chamber Baking Update
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Cao and Aiden put the RGA back on to the chamber and measured the outgassing rate after the chamber has cooled down from its first bake. The figure
attached shows the RGA measurements with the Argon leak open.
Also put the Full Range Gauge #2 [RGA line] back onto the system to measure the pressure and got a reading of 2.78 E-7 Torr. We believe it |
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Thu Jan 26 18:58:25 2023, Aiden, Update, General, Oven Heating
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| Aiden cleaned the oven with methanol again and set the oven to 260 degC for 12 hours. |
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Tue Feb 7 17:27:30 2023, Aiden, Physics, ELOG, Clean and Bake Batch #1
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Cleaned SS parts with liquinox for 20 min. Then put in oven for 5 steps;
1. Ramp, 100 degC, 15 min
2. Const, 100 degC, 30 min
3. Ramp, 200 degC, 30 min
4.
Const, 200 degC, 48 hours
5. Ramp, 25 degC, (off)
PS. Ultrasonic washer does not have heating feature. |
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Fri Feb 10 15:15:30 2023, Aiden, Update, General, Bagging First Batch
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Aiden Bagged and Tagged the first batch of stainless steel parts shown on the google spread sheet.
1. Removed two parts from the oven.
2. Place them
in the ESD bag.
3. Seal bag with Kapton Tape.
4. Create label including part name and number underneath it.
5. Put label onto the side of the bag where
it is not sealed with tape.
6. Placed bagged items into clean room on work table.
ps. total bags in first batch = 4 |
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Mon Feb 13 18:57:53 2023, Aiden, Summary, General, Clean and Bake batch 2
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Cleaned second batch of SS parts with liquinox for 20 min. Then put in oven for 5 steps; 1. Ramp, 100 degC, 15 min 2. Const, 100 degC, 30 min 3. Ramp, 200
degC, 30 min 4. Const, 200 degC, 48 hours 5. Ramp, 25 degC, (off). |
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Fri Feb 17 19:12:39 2023, Aiden, Update, General, Clean and Bake batch 3
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Bagged and Tagged batch 2 parts by placing no more than two parts per ESD bag then taped them with kapton tape and tagged them with their name and part
number. Than placed them inside the clean room on the work bench. Total of 3 Bags used.
For Batch 3- Cleaned all copper gaskets with liquinox for 10
minutes, dried them off with nitrogen, then placed into oven where the are currently undergoing the following steps;
1. Ramp to 100 deg C in 15 minutes.
2. |
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Tue Feb 21 17:51:04 2023, Aiden, Summary, General, Clean and Bake batch 4
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Bagged and Tagged batch 3 parts by placing no more than two part numbers per bag and taped them with kapton tape and labeled them with their name and part
number. Then placed them in the clean room on the work bench.
Cleaned batch 4 parts with liquinox and placed the into the oven for 5 steps;
1. Ramp
to 100 degC in 15 minutes.
2. Dwell at 100 degC for 30 minutes.
3. Ramp to 200 degC in 30 minutes.
4. Dwell at 200 degC for 48 hours.
5. Turn off and |
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Tue Feb 28 19:37:22 2023, Aiden, Summary, General, Clean and Bake batch 5
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Bagged and Tagged batch 4 parts by placing no more than two part numbers per bag and taped them with kapton tape and labeled them with their name and part
number. Then placed them in the clean room on the work bench. Cleaned batch 5 part (Viton O-Ring) with liquinox and placed the into the oven for 5 steps;
1. Ramp to 100 degC in 15 minutes. 2. Dwell at 100 degC for 30 minutes. 3. Ramp to 180 degC in 30 minutes. 4. Dwell at 180 degC for 48 hours. 5. Turn off |
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Fri Mar 3 19:13:33 2023, Aiden, Summary, General, Clean and Bake Batch 6
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Started to clean the dirtiest of the valves. I could not finish but I definitely made good progress on it. The MDC valve is very dirty and there are many
places I could not reach with my fingers. I used Acetone and IPA for this first round of cleaning on it.
I also was going to bag the viton O-Ring from
the previous Batch, however it seems to have broken during the bake and I am leaving it inside the oven for now. |
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Wed Mar 8 19:29:00 2023, Aiden, Summary, General, Clean and Bake batch 7
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Today gave another cleaning to the MDC gate valve. It is still very dirty an will need more cleaning. I also cleaned the other 3 valves and the argon leak.
These are also in bags inside the clean room. I cleaned them by hand with IPA wipes and had to specifically give the MDC up to air valve a harder clean
with acetone as it was not getting clean with the IPA. This valve still has a ring around the face as shown in the first image. Be very cautious when moving |
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Tue Mar 14 18:21:41 2023, Aiden, Summary, General, Clean and Bake batch 8
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Starting off Peter and I refilled the deionized water barrel.
Then Aiden Cleaned and Bake the FROSTI arms and bases in liquinox for 5 minutes. Then placed
them in the oven where they will undergo the following steps;
1. Ramp to 100 degC in 15 min.
2. Dwell at 100 degC for 30 min.
3. Ramp to 120 degC in
30 min.
4. Dwell at 120 degC for 48 hours.
5. OFF
Also cleaned the 2.75 MDC Gate valve for 20 minutes (10 minutes each side) in liquinox. It looks |
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Fri Mar 17 19:46:39 2023, Aiden, Summary, General, Clean and Bake batch 9
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Bagged and Tagged the reflector arms and bases and placed them inside the clean room. Total of 2 bags used. Cleaned and Baked parts in batch 9 on the spread
sheet and used the following procedure;
1. Ramp to 100 degC in 15 min.
2. Dwell at 100 degC for 30 min.
3. Ramp to 200 degC in 30 min.
4. Dwell at
200 degC for 48 hours.
5. OFF
Also soaked the 2.75" CF gate valve in acetone to try and clean the open threads around the part. Then cleaned it in |
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Mon Apr 3 17:04:05 2023, Aiden, Summary, General, IDP Scroll Pump Assembly
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Aiden installed the isolation valve and the exhaust silencer kits on the IDP-3 Scroll pump. The entire assembly still needs to be wiped down but overall
no residue came off when putting on the kits. |
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Wed Apr 12 10:53:02 2023, Aiden, Summary, General, Valve Cleaning
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Bagged and Tagged the parts from batch 10 and placed them inside the clean room.
Then cleaned the last gate valve in liquinox for 20 minutes (10 minutes
each side). Then dried the valve, bagged, tagged, and placed it inside the clean room. |
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Mon Apr 17 17:06:49 2023, Aiden, Summary, General, Clean and Bake batch 11
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Cleaned the Viton O-Ring for the main chamber in Liquinox for 10 minutes. Then put it in the oven to back for;
1. Ramp to 100 degC in 15 min.
2. Dwell
at 100 degC for 30 min.
3. Ramp to 180 degC in 30 min.
4. Dwell at 180 degC for 24 hours.
5. Off
Note: There were three viton -rings in the bag sent
to us. I cleaned and baked 2 of them and left the third in the bag. |
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Mon Apr 24 17:38:45 2023, Aiden, Summary, General, Clean and Bake Batch 12
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Today I Bagged and tagged the o-rings from batch 11 and placed them inside the clean room. I also cleaned batch 12 parts in liquinox for 10 minutes and
them placed them into the oven where they will undergo the following steps;
1. Ramp to 100 degC in 15 min.
2. Dwell at 100 degC for 30 min.
3. Ramp
to 200 deg C in 30 min.
4. Dwell at 200 deg C for 48 hours.
5. Off |
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Thu Apr 27 09:48:34 2023, Aiden, Summary, General, Batch 12 Bagging
|
I took batch 12 out of the oven and put them in a bag and placed the bag inside the clean room in the first large stainless steel container.
I also looked
at the small gauge that we felt like needed to be baked and I can confirm that without further cleaning around the inside of the gauge it should not be
connected to the main vacuum. I have attached a photo of the inside of the gauge. |
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Wed May 10 10:49:34 2023, Aiden, Update, General, RGA Software
|
[Aiden, Cao]
Went over how to use the RGA software, how to change the graph units, scaling and mass detection. Also went over how to remove the RGA from
the vacuum system as well as procedure for turning it on. |
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Wed May 31 16:18:41 2023, Aiden, Summary, General, Mock FROSTI
|
| Finished assembly on the Mock FROSTI so it is ready for the fit test at LIGO lab. |
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Tue Jun 6 16:04:46 2023, Aiden, Update, General, Water
|
| Aiden went and refilled the de-ionized water to continue clean and bake batches. |
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Tue Jun 13 13:25:05 2023, Aiden, Summary, Clean & Bake, Clean and Bake Batch 13
|
Cleaned and Baked the new 1.33" and 2.75" blanks for the vacuum system. Cleaned them with liquinox in the ultra sonic washer for 10 minutes. Then dried
them with nitrogen. Then put the two stainless steel parts into the oven for the following steps;
1. Ramp to 100 degC in 15 minutes
2. Dwell at 100 degC
for 30 minutes
3. Ramp to 200 degC in 30 minutes
4. Dwell at 200 degC for 48 hours
5. Turn off |